HELP!UNABLE TO PLAY ANY GAMES ON MY PC!

Hello Everyone!
please help me as I am not able to play any games on my PC.

System Config:
Processor: C2D 2.93 GHz
Ram: 1 GB
Motherboard: Intel G41 Express chipset
hard disk: 500 GB
OS: windows 7(32-bit)

Problem: BSOD while or after playing games.After that system won't start for a while ,will give 3 beeps( intermittent)and won't boot.On reseting randomly it will start.sometimes it says BAD POOL HEADER.

I tried 3 games viz. POPT2T,Hitman:Blood Money,NFS Most wanted.Initially when I used to play POPT2T,Hitman system will run smooth for 5-6 mins after that BSOD or Turn off immediately but on updating my mother-board display drivers, 5-6 days both games ran fine but again now the same problem.

Please HELP ME OUT!!!THANX!


aayush.